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I met with a tech in Houston an hr ago. He suggested taking the heads off and using Sea Foam. Carbon Build up is a common issue with several BMW V8's and some of the straight 6's as well. He quoted me for $200.00. I did sea foam about 8months ago, but I just put it in the gas tank I never thought about taking the head off and pouring it in there. He also informed me he has performed this job on two 7-series BMW's and was successful at it.

@Adboles - No misprint. The correct amount is $200.00 I am quoted this price because he has done this job twice. He will have my car for two days. I will keep everyone posted. I am scheduling my appointment for tuesday or wednesday of this week.

mrringtone, please let us know if this corrects the secondary air flow too low problem that causes the codes 0491 and 0492 to show up. I would like to talk to him and ask him if he can share how he does this for $200.00 with my mechanic here in Tennessee!! Thank you, I'm looking forward to hearing from you.
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I remember years ago a procedure I used on a 540i I had that I read about for what I recall was carbon build up. It involves the vacuum hose from the pressure regulator, but looking on realoem, our pressure regulator is part of our fuel filter. Is that correct or is there a seperate fuel pressure regulator elsewhere?

After driving my car for a few days. My check engine light did come back on. Since the job is covered under the shops 12month 12,000 miles warranty I will dropping my car off today for a second treatment. The good news is while driving I got 25.5 MPG's which has never happened since owning this car. I believe a small amount was remove but not enough, the tech is determined to have this resolved. I will keep you posted in the next 48-72 hours.

After driving my car for a few days. My check engine light did come back on. Since the job is covered under the shops 12month 12,000 miles warranty I will dropping my car off today for a second treatment. The good news is while driving I got 25.5 MPG's which has never happened since owning this car. I believe a small amount was remove but not enough, the tech is determined to have this resolved. I will keep you posted in the next 48-72 hours.

TXSailor the info is below. My car is there right now so give Joey Noll a call and tell him Ivan referred you and let him know my black 745i is being serviced right now. There work is warranty by 12month 12,000 miles. The other mechanic is Dennie Noll

I have the car apart right now and am trying to get the injector rail off the car so I can pull the manifold off the car. Once I finish this I'll post my results if changing the valve underneath stops p0491. Just need help gettin the injector rail
Off it's stuck.

Check out this TIS at http://tis.spaghetticoder.org/ or go onto ebay and purchase one for 9.99 or 19.99 make sure you have windows if you have mac use bootcamp because VM Fusion Ware will not will work.

Quote:

Originally Posted by italiano

I have the car apart right now and am trying to get the injector rail off the car so I can pull the manifold off the car. Once I finish this I'll post my results if changing the valve underneath stops p0491. Just need help gettin the injector rail
Off it's stuck.

I had the 2 codes p0491 and po492 and my car failed aircare (emissions testing), this is very common problem in the 7 series car. To fix this problems is very expensive...and even after you fix the problems the codes will pop up again. My dealer told me there is no point in fixing these problems as they do not have any affect on the performance of the car. So disabled the secondary air system for me at a cost of 500 dollars, been 2 weeks now and the codes have not come back on and the car passed aircare.